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EP4208433B1 - Granules d'engrais enrobés - Google Patents

Granules d'engrais enrobés

Info

Publication number
EP4208433B1
EP4208433B1 EP21766003.4A EP21766003A EP4208433B1 EP 4208433 B1 EP4208433 B1 EP 4208433B1 EP 21766003 A EP21766003 A EP 21766003A EP 4208433 B1 EP4208433 B1 EP 4208433B1
Authority
EP
European Patent Office
Prior art keywords
polymer
pbsa
core
wax
coating layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21766003.4A
Other languages
German (de)
English (en)
Other versions
EP4208433A1 (fr
Inventor
James Haigh
Ganesh Kannan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SABIC Agri Nutrients Co
Original Assignee
SABIC Agri Nutrients Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SABIC Agri Nutrients Co filed Critical SABIC Agri Nutrients Co
Publication of EP4208433A1 publication Critical patent/EP4208433A1/fr
Application granted granted Critical
Publication of EP4208433B1 publication Critical patent/EP4208433B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G5/00—Fertilisers characterised by their form
    • C05G5/30—Layered or coated, e.g. dust-preventing coatings
    • C05G5/37—Layered or coated, e.g. dust-preventing coatings layered or coated with a polymer
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C9/00—Fertilisers containing urea or urea compounds
    • C05C9/005—Post-treatment
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G5/00—Fertilisers characterised by their form
    • C05G5/10—Solid or semi-solid fertilisers, e.g. powders
    • C05G5/12—Granules or flakes
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G5/00—Fertilisers characterised by their form
    • C05G5/30—Layered or coated, e.g. dust-preventing coatings
    • C05G5/38—Layered or coated, e.g. dust-preventing coatings layered or coated with wax or resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds

Definitions

  • the invention generally concerns polymer coated fertilizer compositions.
  • the invention concerns coated fertilizer granules containing a core containing a plant fertilizer and a coat containing poly butylene succinate adipate (PBSA), a second polymer selected from poly lactic acid (PLA), poly butylene succinate (PBS), or a combination of PLA and PBS, and optionally wax.
  • PBSA poly butylene succinate adipate
  • PLA poly lactic acid
  • PBS poly butylene succinate
  • PLA poly lactic acid
  • PBS poly butylene succinate
  • Soil nutrients such as nitrogen, phosphorus, potassium, calcium and sulfur, as well as trace elements such as iron, zinc, copper, and magnesium, are useful for achieving fostering agriculture and growth of plants.
  • the quantity of these nutrients in the soil may be depleted, resulting in inhibited plant growth and decreased production.
  • fertilizers have been developed to help replace the depleted vital nutrients and to create the right balance of nutrients.
  • WO 2016/099919 A1 discusses delayed released zeolite-based agricultural compositions which may be coated with a polymer material.
  • US 2020/0262766 A1 discusses fertilizer granules coated with polymer domains and wax domains.
  • the solution resides in providing a coated fertilizer granule containing a core containing a plant nutrient and a coat containing particular amounts of PBSA, a second polymer selected from poly lactic acid (PLA) and/or poly butylene succinate (PBS), and optionally wax.
  • PBSA poly lactic acid
  • PBS poly butylene succinate
  • the coat forms a coating on an outer surface of the core. It was found that using particular amounts of PBSA and the second polymer in the coat can provide for a controlled release fertilizer composition where the polymers in the coating layer can degrade fully or at least more than 90 % by weight into carbon dioxide and water within two years in soil under ambient conditions.
  • the polymer coating in the fertilizer granule of the present invention can satisfy OK Biodegradable SOIL certification criteria. It was found that using a higher content of PBSA and lower content of the second polymer than the particular amounts used in the present invention can lead to the polymer coating degrading very quickly and failing to provide for a controlled release composition. It was also found that using a lower content of PBSA and higher content of the second polymer than the particular amounts used in the present invention can provide for a polymer coating that does not degrade sufficiently under ambient conditions and fails to satisfy OK Biodegradable SOIL certification criteria.
  • the present invention is directed to a fertilizer granule.
  • the fertilizer granule contains a core and a coat, the coat forming a coating on an outer surface of the core.
  • the core contains a plant nutrient.
  • the coat contains a poly butylene succinate adipate (PBSA), a second polymer, and optionally wax.
  • the second polymer is poly lactic acid (PLA), poly butylene succinate (PBS), or a combination of PLA and PBS.
  • Combination of PLA and PBS includes blend of PLA and PBS.
  • the coat contains 55 wt. % to 90 wt. % of the PBSA, 10 wt. % to 45 wt.
  • the coat can contain 65 wt. % to 90 wt. % of the PBSA, 10 wt. % to 35 wt. % of the second polymer, based on the total weight of the coat.
  • the coat can contain 65 wt. % to 90 wt. % of PBSA and 10 wt. % to 35 wt. % of PLA, based on the total weight of the coat.
  • the coat can contain 65 wt. % to 90 wt. % of PBSA and 10 wt. %.
  • the coat can contain 0.5 wt. % to 30 wt. % of the wax, based on the total weight of the coat. In some particular aspects, the coat can contain 0 wt. % to 25 wt. % of the wax, based on the total weight of the coat. In some particular aspects, the coat can contain 0.5 wt. % to 25 wt. % of the wax, based on the total weight of the coat. In some particular aspects, the coat can contain 10 wt. % to 34.5 wt. % of the second polymer, 65 wt. % to 89.5 wt.
  • the coat can contain 10 wt. % to 30 wt. % of the second polymer, 70 wt. % to 90 wt. % of the PBSA, and 0 wt. % to 10 wt. % of the wax.
  • the PBSA and the second polymer can be contained in one or more polymer coating layers and the wax can be contained in a wax coating layer, wherein the one or more polymer coating layers are at least partially positioned between the core and the wax coating layer.
  • the wax coating layer can form an outer coating layer of the fertilizer granule.
  • the one or more polymer coating layers can independently contain PBSA and/or the second polymer, e.g., the one or more polymer coating layers can independently contain PBSA; PLA; PBS; PBSA and PLA; PBSA and PBS; PLA and PBS; or PBSA, PLA, and PBS.
  • the core can be coated with a first polymer coating layer and at least a second polymer coating layer, wherein the first polymer coating layer and the second polymer coating layer are different, and can independently contain PBSA and/or the second polymer.
  • the coat can contain the polymers, e.g., PBSA, PLA, and/or PBS at any suitable order, and the polymers e.g., PBSA, PLA, and/or PBS can be in one or more than one coating layers.
  • the wt. % of a polymer, e.g., PBSA, PLA, and/or PBS in a polymer coating layer can be the same and/or vary between the different layers.
  • the wax can be alpha-olefin wax, paraffin wax, or natural wax, or any combinations thereof.
  • the coat can have a thickness of 10 ⁇ m to 100 ⁇ m over the core.
  • the thickness of the coating layers e.g., the one or more polymer coating layers and/or the wax coating layer, can be the same or different and can vary independently.
  • the thickness of the one or more polymer coating layers can vary independently.
  • the plant nutrient of the core can contain nitrogen (N), phosphorus (P), or potassium (K) containing fertilizer, or any combination thereof.
  • the plant nutrient can contain urea.
  • the plant nutrient can further contain a micronutrient and/or a secondary nutrient.
  • the micronutrient and/or the secondary nutrient can be calcium (Ca), sulfur (S), zinc (Zn), magnesium (Mg), manganese (Mn), boron (B), iron (Fe), copper (Cu), molybdenium (Mo), or any combinations thereof.
  • the core can optionally include a urease inhibitor and/or a nitrification inhibitor.
  • the urease inhibitor can be a thiophosphoric triamide derivative, such as N-(n-butyl) thiophosphoric triamide (NBPT).
  • the nitrification inhibitor can be 3,4-dimethylpyrazole phosphate (DMPP), thio-urea (TU), dicyandiamide (DCD), 2-Chloro-6-(trichloromethyl)-pyridine (Nitrapyrin), 5- Ethoxy-3-trichloromethyl -1, 2, 4-thiadiazol (Terrazole), 2-Amino-4-chloro-6-methyl- pyrimidine (AM), 2-Mercapto-benzothiazole (MBT), or 2-Sulfanimalamidothiazole (ST), or any combination thereof, preferably DCD.
  • DMPP 3,4-dimethylpyrazole phosphate
  • TU thio-urea
  • DCD dicyandiamide
  • 2-Chloro-6-(trichloromethyl)-pyridine Natrapyrin
  • 5- Ethoxy-3-trichloromethyl -1, 2, 4-thiadiazol Triangulation
  • AM 2-Amino-4-chloro-6-methyl- pyrim
  • the core contains a plant nutrient and the core components mentioned herein, e.g., optional urease inhibitor and/or a nitrification inhibitor at any concentration, ratio, percent by weight, percent by volume, etc.
  • the core can be of any suitable shape. Shapes can include spherical, cuboidal, cylindrical, puck shape, oval, and oblong shapes, although cores having other shapes can also be made. In some aspects, the core can be spherical. In some aspects, the core can be of cylindrical shape with a circular, elliptical, ovular, triangular, square, rectangular, pentagonal, or hexagonal cross section, although cylindrical shaped core having a cross-section of other shapes can also be made. In some aspects, the core can have a dimension such as length, width, height and/or cross-sectional diameter between 0.5 mm to 5 mm, preferably 2 mm to 4 mm.
  • the fertilizer granule can contain or exclude additional ingredients.
  • the additional ingredients included or excluded can be a preservative, insecticide, fungicide, fragrance, micronutrient, fertilizer, plant growth agent, nutrient, secondary nutrient, trace element, plant protection agent, filler, colorant, etc., or a combination thereof.
  • the fertilizer granule and/or the core is essentially free of i) a binder such as plaster of paris, flour, chalk powder, bleached wheat flour, starch, gluten, kaolin, bentonite, and/or colloidal silica, ii) a filler such as silica, dried distillers grains with solubles (DDGS), MgO, CaO, bone mill powder, chalk powder, rice husk, and/or iii) a pH buffer such as CaCO 3 , Na 2 CO 3 , K 2 CO 3 , MgO, KH 2 PO 4 , NaHCO 3 , and/or MgCO 3 .
  • a binder such as plaster of paris, flour, chalk powder, bleached wheat flour, starch, gluten, kaolin, bentonite, and/or colloidal silica
  • a filler such as silica, dried distillers grains with solubles (DDGS), MgO, CaO, bone mill powder, chalk powder, rice hus
  • the fertilizer granule consist of, or consist essentially of, a core containing a nitrogen containing fertilizer such as urea, and a coat containing PBSA, the second polymer, and optionally wax.
  • the one or more polymer coating layers consist of or consist essentially of PBSA and the second polymer.
  • the coat and/or the one or more polymer coating layers can contain less than 0.05 wt. % or can be free of or essentially free of Lewis acids such as each of metal oxides, metal alkoxides, and metal C 8 to C 20 aliphatic acid salts, titanium dioxide, titanium chloride, aluminum isopropoxide, aluminum halide, and tin dioxide.
  • the coat can cover at least 10 %, 20 %, 30 %, 40 %, or 10 % to 50 % of the outer surface of the core. In other aspects, the coat can cover a majority (e.g., greater than 50 %) of the outer surface of the core. In some aspects, the coat can cover greater than 50 %, at least 60 %, at least 70 %, at least 80 %, at least 90 %, or 100 % of the outer surface of the core. In certain aspects, the coat can cover 60 % to 100 %, or 80 % to 100 %, or 90 % to 100 % of the outer surface of the core.
  • the core can be a prill or can be a granulated, pelletized, compacted, and/or agglomerated core.
  • 85 wt. % to 98 wt. % of the fertilizer granule can be comprised of the core and 2 wt. % to 15 wt. % of the fertilizer granule can be comprised of the coat.
  • the fertilizer granule can be included in a fertilizer blend or a compounded fertilizer.
  • the fertilizer blend or the compounded fertilizer in addition to the fertilizer granules can contain a second fertilizer granule.
  • the second fertilizer granules can contain urea, monoammonium phosphate (MAP), diammonium phosphate (DAP), muriate of potash (MOP), monopotassium phosphate (MKP), triple super phosphate (TSP), rock phosphate, single super phosphate (SSP), or a combination thereof, and the like.
  • the coat and/or the one or more polymer coating layers of the coat can be degraded at least 90%, or at least 95 %, or at least 99%, or at least 99.9 % by weight, or fully within two years in soil under ambient conditions into carbon dioxide and water, as measured using ASTM D5988-96.
  • a method of making a fertilizer granule such as a fertilizer granule is disclosed herein.
  • the method can include providing and/or forming a core containing a plant nutrient, coating the core with one or more solutions containing independently PBSA and/or the second polymer, e.g., PBSA; PLA; PBS; PBSA and PLA; PBSA and PBS; PLA and PBS; or PBSA, PLA, and PBS, to form a polymer coated core, wherein the polymer coated core contains the core coated with PBSA and the second polymer; and optionally coating the polymer coated core with wax.
  • the polymer coated core can contain the one or more polymer coating layers.
  • the coat can be coated with the solutions containing PBSA, PLA, and/or PBS at any suitable order to form the polymer coated core.
  • the wt. % of a polymer, e.g., PBSA, PLA, and/or PBS in a polymer solution can be the same and/or vary between the different polymer solutions.
  • the one or more solutions can independently contain organic solvent(s).
  • the one or more solutions can independently contain organic solvent(s) including chlorinated organic solvents such as methylene chloride, chloroform, etc.; aromatics solvents such as toluene, xylene, etc.; acetonitrile; or any combination thereof.
  • the core can be formed as a prill or by pelletizing, compacting, and/or granulating a composition containing the plant nutrient and optionally include the urease inhibitor and/or the nitrification inhibitor.
  • a method of fertilizing comprising applying the fertilizer granule and/or a fertilizer blend containing the fertilizer granule to at least a portion of a soil, a crop, or the soil and the crop. Also described is a method of enhancing plant growth comprising applying to soil, the plant, or the soil and the plant an effective amount of a composition comprising a fertilizer blend of the present invention.
  • the coating composition contains 55 wt. % to 90 wt. % of a PBSA, 10 wt. % to 45 wt. % of a second polymer, and 0 wt. % to 30 wt. % of a wax.
  • the second polymer is poly lactic acid (PLA), poly butylene succinate (PBS), or a combination of PLA and PBS.
  • Combination of PLA and PBS includes a blend of PLA and PBS.
  • the coating composition can contain 65 wt. % to 90 wt. % of PBSA and 10 wt. % to 35 wt. % of the second polymer.
  • the coating composition can contain 65 wt.
  • the coating composition can contain 65 wt. % to 90 wt. % of PBSA and 10 wt. % to 35 wt. % of PLA.
  • the coating composition can contain 65 wt. % to 90 wt. % of PBSA and 10 wt. % to 35 wt. % of PBS.
  • the coating composition can contain 0.5 wt. % to 30 wt. % of the wax.
  • the coating composition can contain 0 wt. % to 25 wt. % of the wax.
  • the coating composition can contain 0.5 wt. % to 25 wt. % of the wax.
  • the coating composition can contain 65 wt.
  • the coating composition can contain 10 wt. % to 30 wt. % of the second polymer, 70 wt. % to 90 wt. % of the PBSA, and 0 wt. % to 10 wt. % of the wax.
  • the coating composition can be in the form of a film or a sheet.
  • the film or sheet can contain one or more layers.
  • the PBSA and the second polymer can be contained in one or more polymer coating layers and the wax can be contained in a wax coating layer.
  • the one or more polymer coating layers can independently contain PBSA and/or the second polymer, e.g., the one or more polymer coating layers can independently contain PBSA; PLA; PBS; PBSA and PLA; PBSA and PBS; PLA and PBS; or PBSA, PLA, and PBS.
  • the coating composition can contain a first polymer coating layer and at least a second polymer coating layer, wherein the first polymer coating layer and the second polymer coating layer can be different, and can independently contain PBSA and/or the second polymer.
  • the coating composition can contain the polymers, e.g., PBSA, PLA, and/or PBS at any suitable order, and the polymers e.g., PBSA, PLA, and/or PBS can be in one or more than one polymer coating layers.
  • the wt. % of a polymer e.g., PBSA, PLA, and/or PBS in a polymer coating layer can be the same and/or vary between the different polymer coating layers.
  • the wax can be alpha-olefin wax, paraffin wax, or natural wax, or combination thereof.
  • the coating composition can be included in a composition as a coating material.
  • One aspect is directed to a composition containing a material at least partially coated with the coating composition.
  • the coating composition and/or the one or more polymer coating layers of the coating composition can be degraded at least 90%, or at least 95 %, or at least 99%, or at least 99.9 % by weight, or fully in soil under ambient condition within 2 years into carbon dioxide and water, as measured using ASTM D5988-96.
  • the PLA used herein e.g., in the coat of the fertilizer granule and the coating composition can have a weight average molecular weight (Mw) of 100 kg/mol to 200 kg/mol.
  • the PBS used herein e.g., in the coat of the fertilizer granule and the coating composition has a weight average molecular weight (Mw) of 20 kg/mol to 500 kg/mol.
  • the PBSA used herein e.g., in the coat of the fertilizer granule and the coating composition has a weight average molecular weight (Mw) of 20 kg/mol to 500 kg/mol.
  • the Mw of the polymers can be measured by gel permeation chromatography (GPC).
  • fertilizer granules and/or fertilizer blend granules may also be referred to as a particle, granule, fertilizer particle, prill, or fertilizer prill.
  • fertilizer is defined as a material applied to soils or to plant tissues to supply one or more plant nutrients essential or beneficial to the growth of plants and/or stimulants or enhancers to increase or enhance plant growth.
  • fertilizers include materials having one or more of urea, ammonium nitrate, calcium ammonium nitrate, one or more superphosphates, binary NP fertilizers, binary NK fertilizers, binary PK fertilizers, NPK fertilizers, molybdenum, zinc, copper, boron, cobalt, and/or iron.
  • fertilizers include agents that enhance plant growth and/or enhance the ability for a plant to receive the benefit of a fertilizer, such as, biostimulants, urease inhibitors, and nitrification inhibitors.
  • the fertilizer is urea, such as urea granules or prills.
  • granule can include a solid material.
  • a granule can have a variety of different shapes, examples of which include a spherical, a puck, an oval, a rod, an oblong, or a random shape.
  • particle can include a solid material less than a millimeter in its largest dimension.
  • particle or “powder” can include a plurality of particles.
  • aqueous based aqueous base
  • water based water base
  • wt. % refers to a weight, volume, or molar percentage of a component, respectively, based on the total weight, the total volume of material, or total moles, that includes the component. In a example, 10 grams of component in 100 grams of the material is 10 wt. % of component.
  • A, B, and/or C can include: A alone, B alone, C alone, a combination of A and B, a combination of A and C, a combination of B and C, or a combination of A, B, and C.
  • the fertilizer granule of the present invention contains a core containing a plant nutrient and a coat containing particular amounts of PBSA, a second polymer selected from poly lactic acid (PLA) and/or poly butylene succinate (PBS), and optionally a wax, the coat forming a coating on an outer surface of the core.
  • PBSA poly lactic acid
  • PBS poly butylene succinate
  • the fertilizer granule contains a core and a coat forming a coating on the core.
  • the fertilizer granule can contain 85 wt. % to 98 wt. % or at least any one of, equal to any one of, or between any two of 85, 86, 88, 90, 92, 94, 96, and 98 wt. % of the core e.g., 85 wt. % to 98 wt. % of the fertilizer granule can be comprised of the core.
  • the core contains a plant nutrient.
  • the plant nutrient of the core can contain nitrogen (N), phosphorus (P), and/or potassium (K) containing fertilizers, or any combination thereof.
  • the plant nutrient can further contain a micronutrient and/or a secondary nutrient.
  • the nitrogen (N), phosphorus (P), and/or potassium (K) containing fertilizers; and micronutrient and/or secondary nutrient; and the urease inhibitor and/or nitrification inhibitor can be included or excluded in the core of the fertilizer granules.
  • the content of the core of the fertilizer granules can depend on the particular needs of certain types of plant, soil, climate, or other growing conditions to maximize the efficacy of the fertilizer granule in enhancing plant growth and/or crop yield.
  • the nitrogen (N), phosphorus (P), and/or potassium (K) containing fertilizers can include urea, ammonium nitrate, ammonium sulfate, diammonium phosphate (DAP), monoammonium phosphate (MAP), urea-formaldehyde, ammonium chloride, monopotassium phosphate (MKP), triple super phosphate (TSP), rock phosphate, single super phosphate (SSP), muriate of potash (MOP), and potassium nitrate.
  • the micronutrient can be a botanically acceptable form of an inorganic or organometallic compound such as boron, copper, iron, chloride, manganese, molybdenum, nickel, or zinc.
  • the secondary nutrient can be a substance that can deliver calcium, magnesium, and/or sulfur to a plant.
  • the secondary nutrients may include lime, gypsum, superphosphate, or a combination thereof.
  • the plant nutrient contains urea.
  • the core can optionally include a urease inhibitor and/or a nitrification inhibitor.
  • the urease inhibitor can be a thiophosphoric triamide derivative, such as N-(n-butyl) thiophosphoric triamide (NBPT).
  • the nitrification inhibitor can be 3,4-dimethylpyrazole phosphate (DMPP), thio-urea (TU), dicyandiamide (DCD), 2-Chloro-6-(trichloromethyl)-pyridine (Nitrapyrin), 5- Ethoxy-3-trichloromethyl -1, 2, 4-thiadiazol (Terrazole), 2-Amino-4-chloro-6-methyl- pyrimidine (AM), 2-Mercapto-benzothiazole (MBT), or 2-Sulfanimalamidothiazole (ST), or any combination thereof, preferably DCD.
  • DMPP 3,4-dimethylpyrazole phosphate
  • TU thio-urea
  • DCD dicyandiamide
  • 2-Chloro-6-(trichloromethyl)-pyridine Natrapyrin
  • 5- Ethoxy-3-trichloromethyl -1, 2, 4-thiadiazol Triangulation
  • AM 2-Amino-4-chloro-6-methyl- pyrim
  • the core of the fertilizer granules can have desirable physical properties such as desired levels of abrasion resistance, granule strength, pelletizability, hygroscopicity, granule shape, and size distribution, which are important properties for the fertilizer core.
  • the core can be of any suitable shape. Shape includes spherical, cuboidal, cylindrical, puck shape, oval, and oblong shapes. Cores of other shapes can readily be made. In some aspects, the core can be of cylindrical shape with a circular, elliptical, ovular, triangular, square, rectangular, pentagonal, or hexagonal cross section, although a cylindrical shaped core having a cross-section of other shapes can also be made.
  • the core can have a dimension such as length, width, height, and/or cross-sectional diameter between 1 mm to 5 mm or at least any one of, equal to any one of, or between any two of 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, and 5 mm.
  • the fertilizer granule can contain 2 wt.% to 15 wt. % or at least any one of, equal to any one of, or between any two of 2, 4, 6, 8, 10, 12, 14, and 15 wt. % of the coat, e.g., 2 wt.% to 15 wt. % of the fertilizer granule can be comprised of the coat.
  • the coat contains i) 55 wt. % to 90 wt. %, preferably, 65 wt. % to 90 wt. %, or 65 wt. % to 89.5 wt. %, or 70 wt. % to 90 wt. %, or 70 wt. % to 89.
  • the second polymer is PLA, PBS, or a combination or blend thereof.
  • the wax can be alpha-olefin wax, paraffin wax, or natural wax, or combination thereof.
  • the PBSA and the second polymer can be contained in one or more polymer coating layers and the wax can be contained in a wax coating layer, wherein the one or more polymer coating layers are at least partially positioned between the core and the wax coating layer.
  • the wax coating layer can form an outer coating layer of the fertilizer granule.
  • the one or more polymer coating layers and the wax coating layer can form separate coating layers.
  • the one or more polymer coating layers and the optional wax coating layer can form the coat of the fertilizer granule.
  • the one or more polymer coating layers can independently contain PBSA and/or the second polymer, e.g., the one or more polymer coating layers can independently contain PBSA; PLA; PBS; PBSA and PLA; PBSA and PBS; PLA and PBS; or PBSA, PLA, and PBS.
  • the core can be coated with a first polymer coating layer and at least a second polymer coating layer, wherein the first polymer coating layer and the second polymer coating layer are different, and can independently contain PBSA and/or the second polymer.
  • the fertilizer granule can contain a polymer coating layer containing PBSA, PLA, and PBS.
  • the fertilizer granule can contain a polymer coating layer containing PBSA and PLA. In some aspects, the fertilizer granule can contain a polymer coating layer containing PBSA and PBS. In some aspects, the fertilizer granule can contain a polymer coating layer containing PLA and PBS The fertilizer granule contains a polymer coating layer containing PBSA. In some aspects, the fertilizer granule can contain a polymer coating layer containing PBS. In some aspects, the fertilizer granule can contain a polymer coating layer containing PLA. In some aspects, the fertilizer granule can contain one polymer coating layer containing PBSA and another polymer coating layer containing PLA.
  • the fertilizer granule can contain one polymer coating layer containing PBSA and another polymer coating layer containing PBS. In some aspects, the fertilizer granule can contain one polymer coating layer containing PBSA and another polymer coating layer containing PBS and PLA. In some aspects, the fertilizer granule can contain one polymer coating layer containing PBSA and PBS and another polymer coating layer containing PLA. In some aspects, the fertilizer granule can contain one polymer coating layer containing PBSA and PLA and another polymer coating layer containing PBS. In some aspects, the fertilizer granule can contain one polymer coating layer containing PBSA and another polymer coating layer containing PLA and still another polymer coating layer containing PBS.
  • the coat can contain the polymers, e.g., PBSA, PLA, and/or PBS at any suitable order over the core, and the polymers e.g., PBSA, PLA, and/or PBS can be included in one or more than one polymer coating layers.
  • the wt. % of a polymer e.g., of PBSA, PLA, and/or PBS independently, in a polymer coating layer can be the same and/or vary in different polymer coating layers, provided that the total wt. % of the polymers in the coat is as defined above.
  • the one or more polymer coating layers can form a coating over at least a portion of an outer surface of the core to form a polymer coated core.
  • the one or more polymer coating layers can form a relatively uniform coating layer over the core.
  • the wax coating layer can form a coating over at least a portion of an outer surface of the polymer coated core to form the fertilizer granule.
  • At least a portion of the one or more polymer coating layers can be positioned between the core and the wax coating layer.
  • the wax coating layer can form a relatively uniform coating layer over the polymer coated core.
  • the wax coating layer can form an outer coating layer of the fertilizer granule.
  • the one or more polymer coating layers overall can cover or coat 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 99, or 100 % of the outer surface of the core.
  • the wax coating layer can cover 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 99, or 100 % of the outer surface of the polymer coated core.
  • the coat overall can cover 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 99, or 100 % of the outer surface of the core.
  • FIGS. 1A-1D show fertilizer granules according four examples of the present invention.
  • FIG. 1A shows a fertilizer granule 100 according to one example of the present invention, containing a core 101, a polymer coating layer 102 containing PBSA and the second polymer coating an outer surface of the core, and an wax coating layer 103 containing wax coating an outer surface of the polymer coating layer coated core.
  • the polymer coating layer 102 is represented as covering the entire outer surface of the core 101, although fertilizer granules with the polymer coating layer 102 covering a portion of the outer surface of the core can readily be made.
  • the wax coating layer 103 is represented as covering the entire outer surface of the polymer coated core, although fertilizer granules with wax coating layer 103 covering a portion of the outer surface of the polymer coated core can readily be made.
  • FIG. 1B shows a fertilizer granule 110 according to another example of the present invention, containing a core 111, a polymer coating layer 112 containing PBSA and the second polymer coating an outer surface of the core 111.
  • the polymer coating layer 112 is represented as covering the entire outer surface of the core 111, although fertilizer granules with the polymer coating layer 112 covering a portion of the outer surface of the core can readily be made.
  • FIG. 1C shows a fertilizer granule 120 according to another example of the present invention, containing a core 121, a first polymer coating layer 122 containing PBSA coating an outer surface of the core 121, a second polymer coating layer 123 containing the second polymer coating an outer surface of the PBSA coated core to form the polymer coated core, and a wax coating layer 124 containing wax coating an outer surface of the polymer coated core.
  • the first polymer coating layer 122 is represented as covering the entire outer surface of the core 121, although fertilizer granules with the layer 122 covering a portion of the outer surface of the core can readily be made.
  • the second polymer coating layer 123 is represented as covering the entire outer surface of the PBSA coated core, although fertilizer granules with the layer 123 covering a portion of the outer surface of the PBSA coated core can readily be made.
  • the wax coating layer 124 is represented as covering the entire outer surface of the polymer coated core, although fertilizer granules with wax coating layer 124 covering a portion of the outer surface of the polymer coated core can readily be made.
  • FIG. 1D shows a fertilizer granule 130 according to another example of the present invention, containing a core 131, a first polymer coating layer 132 containing PBSA coating an outer surface of the core 131, and a second polymer coating layer 133 containing the second polymer coating an outer surface of the PBSA coated core.
  • the first polymer coating layer 132 is represented as covering the entire outer surface of the core 131, although fertilizer granules with the layer 132 covering a portion of the outer surface of the core can readily be made.
  • the second polymer coating layer 133 is represented as covering the entire outer surface of the PBSA coated core, although fertilizer granules with the layer 133 covering a portion of the outer surface of the PBSA coated core can readily be made.
  • Fertilizer granules containing the polymers e.g. PBSA, PLA, and PBS, in other configuration can readily be made
  • the coating of the fertilizer granule of the present invention allows for controlled release of the fertilizers from the core.
  • the coat and/or the one or more polymer coating layers of the coat can degrade at least 90%, or at least 95 %, or at least 99% or at least 99.9 % by weight, or fully in soil under ambient condition within 2 years into carbon dioxide and water, as measured in accordance with ASTM D5988-96.
  • the core and/or coat can contain a filler, binder, and/or pH buffer.
  • the core and/or coat, based on total weight of the core and/or coat respectively contains less than 0.5 wt. %, or less than 0.1 wt. %, or is substantially free of a filler such as each of silica, dried distillers grains with solubles (DDGS), CaCO 3 , MgO, CaO, bone mill powder, and rice husk.
  • DDGS dried distillers grains with solubles
  • CaCO 3 a filler
  • MgO dried distillers grains with solubles
  • core and/or coat based on total weight of the core and/or coat respectively contains less than 0.5 wt. %, or less than 0.1 wt. %, or is substantially free of a pH buffer such as CaCO 3 , Na 2 CO 3 , K 2 CO 3 , MgO, KH 2 PO 4 , NaHCO 3 , and/or MgCO 3 .
  • the fertilizer granules described herein can be comprised in a composition useful for application to soil.
  • the composition may include other fertilizer compounds, micronutrients, primary nutrients, secondary nutrients, additional urea, additional nitrogen nutrients, additional phosphorus nutrients, additional potassium nutrients insecticides, herbicides, or fungicides, or combinations thereof.
  • the fertilizer granules described herein can also be included in a blended composition comprising other fertilizer granules.
  • the other fertilizer granules can be granules of urea, monoammonium phosphate (MAP), diammonium phosphate (DAP), muriate of potash (MOP), monopotassium phosphate (MKP), triple super phosphate (TSP), rock phosphate, single super phosphate (SSP), ammonium sulfate, and the like.
  • a method for making a fertilizer granule is also described which can include providing or forming a core containing a plant nutrient, contacting and coating at least a portion of an outer surface of the core with one or more solutions containing independently PBSA and/or the second polymer, e.g., PBSA; PLA; PBS; PBSA and PLA; PBSA and PBS; PLA and PBS; or PBSA, PLA, and PBS, to form a polymer coated core, wherein the polymer coated core contains the core coated with PBSA and the second polymer; and optionally coating the polymer coated core with wax.
  • the polymer coated core can contain the one or more polymer coating layers and a core coated with PBSA and the second polymer.
  • the coat can be coated with solutions containing PBSA, PLA, and/or PBS at any suitable order to form the polymer coated core. If the core is coated with more than one solutions containing independently PBSA and/or the second polymer, the solutions can be contacted with core simultaneously or at any suitable order.
  • the core can be coated with the one or more solutions by spraying the one or more solutions on the core.
  • the one or more solutions containing PBSA and the second polymer can independently be heated during spraying of the solutions.
  • the heated solutions can have a temperature of 30 to 150°C or at least any one of, equal to any one of, or between any two of 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, and 150 °C.
  • the polymer coated core can be coated with wax by coating the polymer coated core in a drum with melted wax via drop casting.
  • the wax melt can have temperature of 50 to 120 °C or at least any one of, equal to any one of, or between any two of 50, 60, 70, 80, 90, 100, 110, and 120 °C.
  • the wt. % of a polymer, e.g., PBSA, PLA, and/or PBS, in a solution can be the same and/or vary between the different solutions.
  • the solutions can independently contain suitable solvents such as organic solvent(s) including chlorinated organic solvents such as methylene chloride, chloroform, etc.; aromatics solvents such as toluene, xylene, etc.; acetonitrile; or any combination thereof.
  • FIG. 2 shows a flow chart of a method 200 for making a fertilizer granule according to an example of the present invention.
  • a core 201 containing a plant fertilizer can be coated with one or more solutions 202 containing independently PBSA and/or the second polymer to form a polymer coated core 203, the polymer coated core 203 can be coated with wax 204 to form the fertilizer granule 205.
  • a core in a form of prills, granules, and/or an extrudate, of size 1 mm to 5 mm can be provided in a container, such as a drum coater.
  • One or more solutions containing independently PBSA and/or the second polymer can be sprayed on the granules in the container to form the polymer coated core.
  • the one or more solutions independently can have or can be heated to a temperature of 30 to 150 °C or at least any one of, equal to any one of, or between any two of 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, and 150 °C..
  • the polymer coated core in the container can be drop casted with melted wax to form the fertilizer granule.
  • the wax melt can have temperature of 50 to 120°C or at least any one of, equal to any one of, or between any two of 50, 60, 70, 80, 90, 100, 110, and 120 °C.
  • the core can be a prill or formed by granulating, pelletizing, compacting, and/or extruding a composition containing the core ingredients such as nitrogen (N), phosphorus (P), and/or potassium (K) containing fertilizers.
  • the core can optionally contain micronutrients, secondary nutrients, urease inhibitors, and/or nitrification inhibitors.
  • the coating can be pre-formed, such as a powder blend, sheet, solution, and/or melt, containing the PBSA, the second polymer, and/or optionally the wax.
  • the core can be coated with the pre-formed coating.
  • the pre-formed coating can include the PBSA and the second polymer, the core can be coated with the pre-formed coating to form a polymer coated core and the polymer coated core can be optionally coated with wax to form the fertilizer granule.
  • the fertilizer granule(s) of the present invention can be used in methods of increasing the amount of nitrogen (N), phosphorus (P), and/or potassium (K) containing fertilizers; micronutrients; and/or secondary nutrient in soil and of enhancing plant growth.
  • Such methods can include applying to the soil an effective amount of a composition comprising the fertilizer granule(s) of the present invention.
  • the method may include increasing the growth and yield of crops, trees, ornamentals, etc. such as, for example, palm, coconut, rice, wheat, corn, barley, oats, and soybeans.
  • the method can include applying the fertilizer granules of the present invention to at least one of a soil, an organism, a liquid carrier, a liquid solvent, etc.
  • Examples of plants that can benefit from the fertilizer of the present invention include vines, trees, shrubs, stalked plants, ferns, etc.
  • the plants may include orchard crops, vines, ornamental plants, food crops, timber, and harvested plants.
  • the plants may include Gymnosperms, Angiosperms, and/or Pteridophytes.
  • the Gymnosperms may include plants from the Araucariaceae, Cupressaceae, Pinaceae, Podocarpaceae, Sciadopitaceae, Taxaceae, Cycadaceae, and Ginkgoaceae families.
  • the Angiosperms may include plants from the Aceraceae, Agavaceae, Anacardiaceae, Annonaceae, Apocynaceae, Aquifoliaceae, Araliaceae, Arecaceae, Asphodelaceae, Asteraceae, Berberidaceae, Betulaceae, Bignoniaceae, Bombacaceae, Boraginaceae, Burseraceae, Buxaceae, Canellaceae, Cannabaceae, Capparidaceae, Caprifoliaceae, Caricaceae, Casuarinaceae, Celastraceae, Cercidiphyllaceae, Chrysobalanaceae, Clusiaceae, Combretaceae, Cornaceae, Cyrillaceae, Davidsoniaceae, Ebenaceae, Elaeagnaceae, Ericaceae, Euphorbiaceae, Fabaceae, Fagaceae, Grossulariaceae,
  • the coating composition contains i) 55 wt. % to 90 wt. %, preferably, 65 wt. % to 90 wt. %, or 65 wt. % to 89.5 wt. %, or 70 wt. % to 90 wt. %, or 70 wt.
  • % to 89.5 % or at least any one of, equal to any one of, or between any two of 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 79.5, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 89.5, and 90 wt. % of the PBSA, ii) 10 wt. % to 45 wt. %, preferably, 10 wt. % to 35 wt. %, or 10 wt.
  • the second polymer is PLA, PBS, or a combination or blend thereof.
  • the coating composition can include one or more polymer coating layers and optionally a wax coating layer.
  • the PBSA and the second polymer can be contained in the one or more polymer coating layers and the optional wax can be contained in the optional wax coating layer.
  • the wax coating layer can form an outer coating layer of the coating composition.
  • the one or more polymer coating layers and the wax coating layer can form separate coating layers.
  • the wax can be alpha-olefin wax, paraffin wax, or natural wax, or combination thereof.
  • the one or more polymer coating layers can independently contain PBSA and/or the second polymer, e.g., the one or more polymer coating layers can independently contain PBSA; PLA; PBS; PBSA and PLA; PBSA and PBS; PLA and PBS; or PBSA, PLA, and PBS.
  • the coating composition can include a first polymer coating layer and at least a second polymer coating layer, wherein the first polymer coating layer and the second polymer coating layer can be different, and can independently contain PBSA and/or the second polymer.
  • the coating composition can contain a polymer coating layer containing PBSA, PLA, and PBS.
  • the coating composition can contain a polymer coating layer containing PBSA and PLA.
  • the coating composition can contain a polymer coating layer containing PBSA and PBS. In some aspects, the coating composition can contain a polymer coating layer containing PLA and PBS. In some aspects, the coating composition can contain a polymer coating layer containing PBSA. In some aspects, the coating composition can contain a polymer coating layer containing PBS. In some aspects, the coating composition can contain a polymer coating layer containing PLA. In some aspects, the coating composition can contain one polymer coating layer containing PBSA and another polymer coating layer containing PLA. In some aspects, the coating composition can contain one polymer coating layer containing PBSA and another polymer coating layer containing PBS.
  • the coating composition can contain one polymer coating layer containing PBSA and another polymer coating layer containing PBS and PLA. In some aspects, the coating composition can contain one polymer coating layer containing PBSA and PBS and another polymer coating layer containing PLA. In some aspects, the coating composition can contain one polymer coating layer containing PBSA and PLA and another polymer coating layer containing PBS. In some aspects, the coating composition can contain one polymer coating layer containing PBSA, and another polymer coating layer containing PLA, and still another polymer coating layer containing PBS.
  • the coating composition can contain the polymers, e.g., PBSA, PLA, and/or PBS at any suitable order, and the polymers, e.g., PBSA, PLA, and/or PBS can be included in one or more than one polymer coating layers.
  • the wt. % of a polymer e.g., of PBSA, PLA, and/or PBS independently, in a polymer coating layer can be the same and/or vary in different polymer coating, provided that the total wt. % of the polymers in the coating composition is as defined above.
  • the coating composition and/or the one or more polymer coating layers of the coating composition can be degraded at least 90%, or at least 95 %, or at least 99% or at least 99.9 % by weight, or fully in soil under ambient condition in 2 years into carbon dioxide and water, as measured using ASTM D5988-96.
  • Urea granules were coated with coating compositions containing PBSA and PLA in three experiments.
  • urea granules of size 1 mm to 5 mm were coated with a bi-layer coating containing PBSA and PLA.
  • Each of the 2 layers of the bi-layer coating contained PBSA and PLA, but the wt. % of the polymers were varied independently between the layers, where the wt.% of PLA in the inner layer (e.g. directly over the core) was higher compared to that in the outer layer.
  • the outer layer was also twice as thick compared to the inner layer.
  • the bi-layer coating in total contained 90 wt. % of PBSA and 10 wt. % of PLA. In experiment 1, on average about 2 wt.
  • each of the fertilizer granules were comprised of the bi-layer coat.
  • experiment 2 on average about 3 wt. % of each of the fertilizer granules were comprised of the bi-layered coat.
  • experiment 3 urea granules of size 1 mm to 5 mm were coated with a single layer coating containing PBSA and PLA. The coating contained 90 wt. % of PBSA and 10 wt. % of PLA.
  • on average about 3 wt. % of each of the fertilizer granules were comprised of the single layered coat.
  • the fertilizer granules were kept in water for 24 hours at 20 °C and the amount urea released from the core after 24 hours was measured.
  • the wt. % of urea released for experiments 1 - 3 are shown in Table 1.
  • Comparison of urea release between experiments 1 and 2 shows increasing coating wt. % in the fertilizer granules decreases urea release from the core (46.48 wt. % vs. 12.09 wt. % respectively).
  • Comparison of urea release between experiment 3 and 2 shows, a bi-layer coating can decrease urea release from the core compared to a single layer coating (16.81 wt. % vs, 12.09 wt. % respectively).
  • Table 1 Coated Fertilizer granules Coating formulation Average coat wt. % in the fertilizer granules 24 hr. water release, 20°C Experiment 1 90 wt. %/10 wt. % 2 46.48% PBSA/PLA, Bi-Layer Experiment 2 90 wt. %/10 wt. % 3 12.09% PBSA/PLA, Bi-Layer Experiment 3 90 wt. %/10 wt. % 3 16.81% PBSA/PLA, Single-Layer

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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
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  • Wood Science & Technology (AREA)
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Claims (13)

  1. Granulé d'engrais comprenant :
    un noyau comprenant un nutriment pour plante ; et
    une enveloppe comprenant 55 % en poids à 90 % en poids de polysuccinate adipate de butylène (PBSA) et 10 % en poids à 45 % en poids d'un deuxième polymère choisi parmi le polyacide lactique (PLA), le polysuccinate de butylène (PBS), ou une combinaison ou un mélange de PLA et de PBS, et 0 % en poids à 30 % en poids d'une cire sur la base du poids total de l'enveloppe, l'enveloppe formant un enrobage sur une surface extérieure du noyau.
  2. Granulé d'engrais selon la revendication 1, dans lequel l'enveloppe comprend 65 % en poids à 90 % en poids de PBSA et 10 % en poids à 35 % en poids de PLA.
  3. Granulé d'engrais selon la revendication 1, dans lequel l'enveloppe comprend 65 % en poids à 90 % en poids de PBSA et 10 % en poids à 35 % en poids de PBS.
  4. Granulé d'engrais selon la revendication 1, dans lequel l'enveloppe comprend 0,5 % en poids à 30 % en poids de la cire.
  5. Granulé d'engrais selon les revendications 1 à 4, dans lequel le PBSA et le deuxième polymère sont compris dans au moins une couche d'enrobage de polymère et la cire est comprise dans une couche d'enrobage de cire, dans lequel l'au moins une couche d'enrobage de polymère est située au moins partiellement entre le noyau et la couche d'enrobage de cire.
  6. Granulé d'engrais selon les revendications 1 à 5, dans lequel le PBSA et/ou le deuxième polymère sont compris dans une première couche d'enrobage de polymère et au moins une deuxième couche d'enrobage de polymère, dans lequel la première couche d'enrobage de polymère et la deuxième couche d'enrobage de polymère sont différentes.
  7. Granulé d'engrais selon les revendications 1 à 6, dans lequel l'enveloppe comprend une cire et la cire est une cire d'alpha-oléphine, une cire de paraffine, ou une cire naturelle, ou des combinaisons de celles-ci.
  8. Granulé d'engrais selon les revendications 1 à 7, dans lequel le PLA a un poids moléculaire moyen en poids (Mw) de 100 kg/mol à 200 kg/mol, le PBS a un poids moléculaire moyen en poids de 20 kg/mol à 500 kg/mol, et/ou le PBSA a un poids moléculaire moyen en poids de 20 kg/mol à 500 kg/mol, tel que mesuré par GPC.
  9. Granulé d'engrais selon les revendications 1 à 8, dans lequel l'enveloppe comprend 10 % en poids à 30 % en poids du PLA et/ou du PBS, 70 % en poids à 90 % en poids du PBSA, et 0 % en poids à 10 % en poids de la cire.
  10. Granulé d'engrais selon les revendications 1 à 9, dans lequel l'enveloppe a une épaisseur de 10 µm à 100 µm sur le noyau.
  11. Granulé d'engrais selon les revendications 1 à 10, dans lequel le nutriment pour plante contient de l'azote (N), du phosphore (P), ou du potassium (K) ou toute combinaison de ceux-ci.
  12. Granulé d'engrais selon les revendications 1 à 11, dans lequel le nutriment pour plante contient de l'urée.
  13. Granulé d'engrais selon les revendications 1 à 12, dans lequel le granulé d'engrais comprend 85 % en poids à 98 % en poids du noyau et 2 % en poids à 15 % en poids de l'enveloppe.
EP21766003.4A 2020-09-01 2021-08-30 Granules d'engrais enrobés Active EP4208433B1 (fr)

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US20230312430A1 (en) 2023-10-05
CN116261556A (zh) 2023-06-13
AU2021337842A1 (en) 2023-03-23
CN117303986A (zh) 2023-12-29
WO2022049476A1 (fr) 2022-03-10

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